A new distance indicator for spiral galaxies?

Details A new distance indicator for spiral galaxies? A new distance indicator for spiral galaxies?

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..49...20g&link_type=abstract

Messenger, No. 49, p. 20 - 21, 24

Physics

1

Distance Indicators:Spiral Galaxies, Spiral Galaxies:Distance Indicators, Spiral Galaxies:Tully-Fisher Relation, Tully-Fisher Relation:Spiral Galaxies

Scientific paper

With an observed dispersion of 0.45-0.55 mag, the Tully-Fisher (T-F) relation between the maximum rotation velocity Vm, deduced from HI profiles at 21 cm, and the luminosity of spiral galaxies is a good method for determining relative distances of clusters of galaxies. However, the scatter in the relation is larger than can be accounted for by observational errors only. In particular the B-band T-F relation is probably not single-valued (i. e. an Sb with a maximum rotation velocity equal to that of an Sc is fainter in the blue than the Sc). It is generally thought that the use of infrared magnitudes (H band at 1.6 um) tends to reduce the scatter. But a major disadvantage at H is the absence of a system of diameters (H magnitudes are measured within a standard aperture ratio, fixed at - 31 % of the isophotal blue diameter at 25 mag arcsec^-2

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